Ignition coil



M. MALLORY IGNITION COIL April 16, 1935.

Filed Aug. 5, 1933 v INVENTOR. Ham/01v M041 0/? r ATTORNEY.

Patented Apr. 16, 1935 UNITED STATES PATENT OFFICE poration of Delaware 7 Application August 5, 1933, Serial No. 683,736

9 Claims.

The object of this invention is to provide an improved ignition coil, which can be assembled without the use of a sealing compound.

This problem is'briefiy:-

To place the windings of the coil around the core into a bakelite case and to hold the core from axial and radial movements without the use of the usual sealing compound.

The solution is briefly:- To provide a slot in the roof of the case and a similar slot in the inside of the cover. Inside of I these slots, rest the two ends of the laminated core of the coil, which are flexed or bent at right angles to the plane of the laminations. When the cover is pressed into place, the coil is thus securely held by the laminations, which yield under pressure just far enough to insure that the coil is held securely against displacement in any direction by the inertia shocks to which an automobile is subjected. The coil thus floats by means of the clastic suspension exerted by the laminated core.

The minor problem is to provide means for clamping the coil to the support in the car without providing a complete electrical circuit, which would choke the coil. g

The solution here is to break the electrical circuit without weakening the mechanical connection.

The third problem, of course, is to give the best possible coil for the least possible money. This problem, of course, could never be completely solved, as the standard of performance changes as new materials become available.

In the flguresw- I Figure 1 shows diagrammatically the location of the coil in the ignition circuit.

Figure 2 shows the coil in cross-sectional elevation on the plane 22 of Figure 3.

Figure 3' shows the coil in cross-sectional e1evation on the plane 33 of Figure 2.

Figure 4 is a plan view or the coil, showing the supporting clamp.

In Figure 1, 9 is the circuit breaker mechanism and III is the battery. II is the primary circuit of. the coil |'2.' -The.coil |2 comprises a high tension circuit l3, consisting of a large number of turns compared with a smaller number of turns in the primary circuit H. H is the distributor.

In Figures 2 and 3, I5 is the high tension cable, which connects the distributor H to the coil l2. I8 is a rubber insulating bushing, which is clamped by means of the cap'screws I1 and the nose piece l8 to the coil housing l9, which is made of insulating material such as bakelite.

The cable I! contacts with the insulated hightension wire 2|]. which is the outlet from the high tension turns l3 of the coil |2. These high tension turns are wound next to the laminated core 2| and 22.v 23 and 2| arethe low tension terminals of the outer low tension turns of the circuit H of the coil l2. Note that neither I nor |3 are shown in these Figures 2 and 3, as the complete coil I2 is not shown in sections. Through-the center of each of the terminals 23 and 24,'a hole is drilled, and, through these holes, 10 the wires pass, connecting with the low tension turns I r A cover carries these low tension terminals 23 and 24, and, when clamped to the coil housing or case l9, it clamps the coil into place. In order 15 v to secure this'result, a slot 25 is provided in the cover 25 into which slot lit the end laminations of the core 2| and 22. In the roof of the.case or housing IS, a corresponding slot 21 is provided into which also fits the laminated core 2| 20 and 22. The cover 25 is held against a gasket 23 by means of the strap or ring 29, which is spun around the cover 25 while the latter is pressed against the case or housing I3. 7

In Figure 4, a clamp is shown comprising straps 25 3| and 32 held together by a bolt 30. A double hook 33 connects 3| and 32. To break the electrical circuit, an insulated strip 34 is provided between the hook 33 and the respective straps 3| and 32.

. Assembling The coil I2 is built up with the hightension turns l3 wrapped around the laminations of the core 2| and 22. Outside the turns 3, the low tension turns H are wound. The coil |2 thus made is placed so as to engage with the edges of the slot 21 inside of the roof I9, and the insulated high tension terminal 20 is threaded into the top of the case I9. The low tension terminals of the-coil |2 are then threaded through the hollow terminals 23 and .24. The cover 25 is then pressed down upon the open end of the case l9, so as to compress the outwardly bent ends of the laminations 2| and 22 into the slots 26 and 21. Whilst held in this compressed condition, a ring of metal 29 is spun around the coil casing and cover after the gasket 28 has been inserted in place. The result is that the coil I2 is held on both ends elastically.

One advantage of this construction is that the low tension terminals are outside, and the high' tension secondary. turns are located inside so that the low tension terminals act as a shield to the radio waves set up by the high tension secondary 55 prising a coil having the low tension turns wound outside and around the high tension turns which are wound around a laminated iron core, an open ended case of dielectric material, a cover adapted to close the open end, a high-tension terminal in the closed end of the case and two low tension terminals in the cover, corresponding terminals leading out of saidcoil, meansfor clamping said cover to said case so as to compress the laminations of said core, which yieldingly engage with both the end of said case and said cover for the .purpose described.

2. Means for supporting and protecting an ignition coil having a core with flexible end pieces and a high tension terminal at one end and two low tension terminals at the other, comprising an open ended case of dielectric material enclosing said coil, said case having a conical closed end and a high tension cable therein, adapted to be connected with the high tension terminal of the coil, a cover having two low tension terminals adapted to be connected with-the two low tension terminals of the coil, means for clamping the cover to the case, so as to compress the yieldable ends of the core for the purpose described.

3. An ignition coil and case therefor, comprising an open ended case of dielectric material, a cover therefor, a;laminated metal core, low and high tension turns wound around said core, electrical terminals for said turns, said laminated core being bent at both ends in both directions so as to form a symmetrical yieldable support for the coil in the case, means in the closed end of the case for engaging with the bent ends of said core to prevent the coil from twisting in the case, means for clamping the cover to said case so as to compress the bent ends of said core.

4. An ignition coil and case therefor, compristallic strips, low and high tension turns wound around said cores, electrical terminals for said turns, said laminated core being insulated from said high and low tension turns, a slot in the closed end of said case, a corresponding slot in the cover, said core being bent at both ends in both directions so as to form a symmetrical yieldable support for said coil in said case, said core being adapted toflt into said slots so as to prevent the coil from twisting in the case and break ing said terminals, means for clamping said cover to said case so as to elastically compress said laminations for the purpose described.

5. Means for supporting and protecting an ignition coil having a core, with flexible end pieces, comprising an open ended case of dielectric material, a cover therefor, a slot in said cover, a corresponding slot in the closed end of said case, said slots being adapted to engage with and to locate the flexible ends of said core, means for clamping the case to said cover for the purpose described.

. 6. A supporting clamp'for an ignition coil, comprising two metal brackets, each partially embracing said coil, a third metallic piece engaging with the ends of said brackets, an insulating strip located between the brackets and the third piece for the purpose described.

' 7. A supporting clamp for an ignition coil, comprising two metal brackets, each partially embracing said coil, terminating in hook-shaped ends, ahook-shaped metallic piece adapted to engage with the ends of said brackets, insulation between said hook and said clamp for the purpose described.

8. An ignition coil assembly comprising a case of dielectric material open at one end, a cover for the open end, a core formed of metallic strands, low and high tension turns wound about said strands, said strands having their ends bent substantially at right angles to the axis of the coil and held under elastic tension by compression between said cover and the closed end of the case, said compression being in a direction parallel to the central portion of the core.

9. An ignition coil assembly comprising a case of dielectric material open at the bottom, a cover clamped tosaid bottom, low and high tension windings within said case, low and high tension leads into the case, the high tension lead being through the top thereof, a nose piece secured to the top and forming therewith a stream lined contour to drain water away from the high tension lead, and a rubber bushing for the high tension lead within the nose piece and clamped between the latter and the top of the housing to exclude water from the interior of the case.

' MARION MALLORY. 

